What is the gas/oil ratio for a yz 125, and what is the best kind of gear oil to use? Can u use trans. fluid?

It depends on the type of oil you are mixing. 32:1 (4 ounces oil to a gallon of fuel), is a safe although for some types of oil that is a bit much. You can run ATF in the bottom end, it doesn't offer any cusion for the gears but it keeps the clutch in good shape.What is the gas/oil ratio for a yz 125, and what is the best kind of gear oil to use? Can u use trans. fluid?
32:1 if ridden on an MX track, 36:1 if trail riding. Yamalube R or Mobil 1 MX2T are good pre-mix oils.





Spectro 80wt is a decent motorcycle trans oil, but pricey. In my off-road bikes I run a 50/50 blend of Type F ATF and 10w-30 motor oil (usually the lowest price shelf brands). I change gear oil often, every 2 to 3 trail rides or every race. My '98 GasGas EC250 still has the original clutch.

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